Book Image

Delphi High Performance

By : Primož Gabrijelčič
Book Image

Delphi High Performance

By: Primož Gabrijelčič

Overview of this book

Delphi is a cross-platform Integrated Development Environment (IDE) that supports rapid application development for Microsoft Windows, Apple Mac OS X, Google Android, iOS, and now Linux with RAD Studio 10.2. This book will be your guide to build efficient high performance applications with Delphi. The book begins by explaining how to find performance bottlenecks and apply the correct algorithm to fix them. It will teach you how to improve your algorithms before taking you through parallel programming. You’ll then explore various tools to build highly concurrent applications. After that, you’ll delve into improving the performance of your code and master cross-platform RTL improvements. Finally, we’ll go through memory management with Delphi and you’ll see how to leverage several external libraries to write better performing programs. By the end of the book, you’ll have the knowledge to create high performance applications with Delphi.
Table of Contents (16 chapters)
Title Page
Copyright and Credits
Packt Upsell

Optimizing method calls

I know you are eagerly waiting to optimize some real code, but please let me stay for a little bit more on the theoretical side of the equation. I spent all that time talking about the behavior of built-in data types but I didn't say anything about how data is passed to methods. This, much shorter and more surprising section (you'll see!) will fix this. As I'll be talking about speeding up method calls, I'll also throw in a short discussion of method inlining, just for a good measure. But first, parameters!

Parameter passing

In essence, Delphi knows two ways of passing parameters to a method (or procedure, or function, or anonymous method, it's all the same). Parameters can be passed by value or by reference.

The former makes a copy of the original value and passes that copy to a method. The code inside the method can then modify its copy however it wants and this won't change the original value.

The latter approach doesn't pass the value to the method but just an address...